do porridge

"With my record I'll probably end up doing porridge again.

I am delighted to find they also do porridge.

This is similar to a phrase in England with the same meaning: "to do porridge."

This is why in English there is a slang expression "doing porridge" which means "being in prison".

Prisoners do porridge.

'But I'm saying you've been doing porridge!'

"Doing porridge" is British slang for serving a prison sentence, porridge once being the traditional breakfast in UK prisons.

It was also commonly used as prison food for inmates in the UK prison system and so "doing porridge" became a slang term for a sentence in prison.